Motor with rotating piston.



PATENTED MAY 19, 1903.

G. SILVESTRI. MOTOR WITH ROTATING PISTON.- APPLIUATION FILED 1'53. 26. 1902. H0 MODEL. 3 SHEETS-SHEET 1.

- Eh es: 1

No. 728,630. 7 PATENTED MAY 19, 1903. G. SILVESTRL.

MOTOR WITH ROTATING PISTON.

APPILIOATION FILED FEB. 26. 1902.

,3 SHEETS-SHEET 2.

10 MODEL,

PATENTED MAY 19, 1903.

' G. SILVESTRI.

MOTOR WITH ROTATING PISTON APPLICATION nun) 21:12. 26, 1902. 10 MODEL. 3 SHEBTS SHEET a.

Patented May 19, I903.

GIULIO SILVESTRI, OF VIENNA, AUSTRIA-HUN GARY.

MOTOR WITH ROTATING PISTON SPECIFICATION forming part of Letters Patent N 0. 728,630, dated May 19, 1903. Application filed February 26,1902. Serial No. 95,787. (No model.)

To all w/tom it may concern.-

Be it known that I, (Home SILVESTRI, a citizen of Austria, residing at Vienna, in the Province of Lower Austria, Austria-I lungary, have invented certain new and useful Improvements in RotaryEngines, of which the following is a specification.

This invention relates to motors with retary pistons of that class in which the radial outward movement of theslides of the rotary piston is elfected by the motor fluid itself and in which the slides are guided in special guide-planes arranged in the cylinder-casing bore. It has been found in engines of this character that the springs used to press the slides of the rotary piston in radial outward direction would, due to the effect of the steam and heat, deteriorate, and so be impaired in their effectiveness.

The object of this invention is to do away with the springs and with the disadvantages accompanying the same and also to provide means whereby a movement of the slides is produced without the objectionable shocks attendant many of the engines hitherto in use when passing the abutments; and for this purpose the invention consists of a rotary engine having a cylinder-casing provided with inlet and exhaust ports and bearings, a hollow shaft in said bearings, a piston on said shaft rotatable in the cylinder-casing and provided with radial recesses, slidesin said radial recesses, sliding pistons also in said radial recesses adapted to be moved by the motor fluid entering the hollow shaft for forcing the slides outwardly against the casing-boi'e, adjustable spring-actuated abutments in recesses of the casingbore, and packing-strips on the ends of the abutments provided with elastic extensions the ends of which bear in recesses of the casing-bore, so as to be flush with the same, while the extensions are of a curvature corresponding to an osculating circle of the circle of the casingbore, as will be described more fully hereinafter and finally pointed out in the claim.

In the accompanying, drawings, Figure '1 is a longitudinal section on line A B of Fig. 3. Fig. 2 is a longitudinal section .on line C D of'Fig. 3. Fig. 3 is a vertical transverse section on line E F of Fig. 1, and Fig. 4 shows ment isa metal plate or partly a section on line G H of Fig. 1 and partly the cover of the casing'in elevation.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, a represents the casing of the rotary engine, provided withinlet and exhaust ports and bearings and in which casing the piston b is centered in such a manner that between the piston b and the wall of the casing a an annular passage 0 is formed, which is interrupted at one or more points by abutments The piston b is provided with radial recesses in which are-guided slides (Z. he abutments are guided in recesses of the cyl inder-casing a and protrude beyond the same radially inwardly into the annular passage o. Fixed on the inner side of each abutpacking-st-rip 9, provided with extensions on, passing to recesses h of the casing-bore, so as to be flush with the same and of such curvature as to correspond to a circle which osculates on the circle of the casing-bore. The elastic ends 212 of the packing-strips g bear on the casing wall and form guides for the movement of the slides d in the recesses of the rotary piston, whereby, due to the special curvature of the guides, at shockless movement of the slides is accomplished. N o matter how theabutmentsfare adjusted the extennsios m wilLalways bear with their endsin the recesses of the casing-bore, and so always provide an obstrnctionless and proportionatelysmooth passage to the slides d. Heretofore the guide-plane, which regulates the radial movementof the slides, had always a circular form and was determined by the inter-.iectien of the guide-circle with the circle of the easing-bore. This curvature caused the action of the slides to be accompanied by shocks. A shockless passage of the slides requires such a form of guide-plane us to cause the follower or slide to be first equally eoceler ated and then equally retarded. The directrix which regulates this movement is characterized thereby that its ends are tangent to the circle of the casing-bore. Therefore the guide-planes correspond to oscillating circles of the casing-bore, whereby a raising and lowering of the slides unaccompanied by the l objectionable shobks is accomplished. The l of steam any other motor fluid-as compressed abntments f are pressed against the rotary piston b by means of springs 76, which are interposed between flanged bolts 2' and screws q in the casing-wall a. By means of the screws q the tension of the springs k, and

thereby also the pressure of the abutments on the rotary piston, can be regulated. The shaft n, which is attached to the rotary piston b, is provided with a recess 0, which is connected with the supply of motor fluid. The central part ofthe shaft is provided with radial recesses for sliding pistons 19, which pass radially outwardly into the recesses of the rotary piston guiding the slides d and are so arranged as to press the slides din ontward direction when the sliding pistons 17 are acted upon by the motor'fluid entering thehollow shaft 9%. By the arrangement of the parts the pistons p and slides cl are equally pressed against the casing-bore and abutments. By means of these sliding pistons the use of springs is obviated.

It has been found in engines with rotary pistons that the. casing is deformed, so that the slides at some points press closely against the casing-bore, while at other points there are spaces between the slides and the casing. bore, This inequality c'ausedleakage, and therefore a poor utilization of the motorpower.

the casingwalls abnormally thick, at least equal to or larger than the half radius of the casing-bore, and to provide ribs on the casing to strengthen the same, which enable the casing to resist the high variable radial pressure without damage, whereas to reduce the weight holes are arranged in the walls. In the place For this reason I propose to make air, steam, and the likemay be used, and the passages for admission and. exhaust of the motor fluid may be provided on the inside or outside of the casing-wall. The rotary engine may also be used as a pump, in which case a belt or coupling with a motor is provided.

Having now described my invention, I

claim as new and desire to secure by Letters Patent- In a rotary engine, the combination, of a cylinder-casing provided with inlet and exhaust ports and bearings, a hollow shaft in said bearings and radial recesses in said shaft, a piston on said shaft rotatable in the cylin- Ger-casing and provided with radial recesses, slides in said radial recesses of the piston, sliding pistons in the recesses of the shaft and recesses of the piston, and adapted to be moved by the motor fluid entering the hollow shaft radially outwardly against the slides, adjustable spring-actuated abutments inrecessesof the cylinder-casing bore, and packing-strips on the ends of the abutments provided with elastic extensions, the ends of which bear in recesses of the casing-bore, so as to be flush with the same, while'the extensions are of a curvature corresponding to an oscillating circle of the circle of the easing-bore, substantially as set forth.

In testimony that I claim the foregoing as my invention I'have signed my name in presence of two subscribing witnesses.

, GIULIO SILVESTRI.

Witnesses:

W'ILHELM BERGER, ALvEsT0 S. HOGUE. 

